Gimbal lock? I've been building in 3space for more than a decade (was using DKB back before GUIs) and hadn't heard that term. HOWEVER, I have just spent a delightful time with the dictionaries. "Gimbal lock" wasn't in any of them, not even the O.E.D., but I came across a couple of other useful tidbits. (For example, the female gnome is properly called "gnomide".) Thank you, bloodsong.